Pneumatic plastering-machine.



P. L. (IRON.

PNEUMATIC PLASTERING MACHINE.

uruonzon nus muss. 1912.

1,053,014, Patented Feb. 11, 1913.

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F 1 U1 5 5 I G F G Q s N S I 3 S 5 5 Z I V Q Q V l G GB .Q 8 I I WITNESSES INVENTOR Pel'er L. (Iv-on ATTORNEYS P. L. GRON.

PNEUMATIC PLASTERING MACHINE.

APPLICATION FILED JUKE 5. 1812. 1,053,014, Patented Feb.11,1913.

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WIT/758858 INVfNTOR Pefer- L. Cr-on K M W ATTORNEYS (emu-nu Muoann (0 vumnomu. law :4

UNITED, STATES PATENT OFFICE PETER I. CRON, OF ELIZABETH, NEW JERSEY.

PNEUMATIC PLASTERING-MACHINE.

Specification of Letters Patent.

Application filed June 5, 1912.

Patented Feb. 11, 1913. Serial No. 701,195.

T 0 all whom it may concern:

Be it known that I, PETER L. CRON, a citizen of the United States, and a resident of Elizabeth, in the county of Union and State of New Jersey, have invented a new and Improved Pneumatic Plastering-Machine, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved pneumatic plastering machine arranged to insure the proper delivery of a plastic mass, such as plaster, to a distant point, to permit of cleaning the pipe connections, and to allow the operator in charge of the applying nozzle to automatically shut off the supply of the plastic mass, and to readily signal to the operator in charge of the machine in case the plastic mass from one supplying chamber is exhausted so that another supplying chamber can be connected up to supply more plastic material and to avoid delay in supplying the plastic mass where needed.

For the purpose mentioned use is made of two chambers, each adapted to contain a plastic mass and provided with an outlet, tubular connections leading from the outlet to an applying nozzle for discharging the plastic mass onto a surface to be plastered, a source of pressure supply and a series of jet pressure devices connected with the said source of pressure supply and connecting with the said tubular connections to impart propelling impulses successivel to the mass to force the latter in a continuous stream through the said tubular connection and to and through an applying nozzle held on the end of the tubular connection.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar c aracters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the pneumatic plastering machine, parts being shown in elevation, Fig. 2 is a plan view of the same; Fi 3 IS a cross section of the same on the line 3-3 of Fig. 1; and Fig. 4 is an enlarged cross section of one of the outlet valves and the releasing mechanism therefor, the section being on the line 44 of Fig. 1.

As shown in the drawings, two verticallyoisposed chambers or reservoirs A and A are employed for containing plastic material, such as plaster, in a moist, semi-fluid state, and the chambers are provided at their upper ends with hopper-shaped filling heads B, B for guiding the mass or material into a corresponding chamber without filling the same, and the said heads B and B are adapted to be hermetically closed, after the chambers are filled, by covers C, C hung on levers D, D fulcrumed at D on the corresponding head 13 or B. A locking bolt D engages each lever D, D near its free handle end to securely fasten the corresponding lever in place and to firmly press the cover C or C in engagement with the head B or B. Each cover C, C is provided with a gasket of rubber or other material to prevent leakage of air from the vessel A or A by way of the head B or B.

The vessels A, A are rovided at their lower ends with hoppers aped bottoms E, E having removable and lntercl'lan 'eable outlet spouts E provided with did'erent openings so as to allow of discharging plaster in a thicker or thinner stream from the corresponding chamber A or A. On the bottoms E, E are secured valves F, F, of which one is open while the other is closed, as shown in Fig. 1, so that the material or plastic mass from one of the chambers A or A is used at the time for plastering purposes, as hereinafter more fully explained. 'lhe valves F and F are connected at the outlet side with pipe fixtures (l, 1 connected with anglilarly-disposccl pipes G, G, leading to a cross-shaped pipe (ixture H at opposite sides thereof so that the pipes G, G" diverge from the said crossshaped pipe fixture H, as will be readily understood by reference to Fig. 1. The lower end or the underside of the cross shaped pipe fixture H is provided with a nozzle I surrounded by a pressure chamber 1' attached at its upper end to the nozzle I, and to the lower end of the said pressure chamber I is secured an angular pipe fixture J to which is coupled or otherwise fastened one end of a hose K of any desired length and terminating in an applying nozzle L for applying the plaster or other plastic mutcmat to a wall or other surface to be plastercd.

Into the upper end of the cross-shaped pipe fixture H discharges a jet pipe N connected at its upper end with a pipe N connected with a pipe 0 forming part of the supporting frame 0 of the machine and which supporting frame 0 is formed, besides the side pipe 0, with a second side pipe 0 and end cross ipes O and O, as plainly indicated in Hg. 2. One of the side pipes (as shown, the side pi e O) is connected with a suitable source 0? pressure supplg, such as compressed air from the jet pipe againstthe mass passin into the pipe fixtureH from the pipes and G. The pipe N is rovided with a valve N for controlling tie amount of com ressed air passing to the jet pipe N for siutting oil the sup ly of compressed air whenever it is desired to do so. The cross pi es 0 and O are connected by pipe P, P iiaving valves P and P connected with the upper ends of the chambers A, A to supply the said chambers with com )ressed air to force the mass out of the ciambers and down through the valve F or F open at the time. Pipes Q and Q are provided with branch pipes Q, Q having valves Q, Q, and opening into the pi )e fixtures G and G directly under the deflector points G, G formed in the said pipe fixtures, to defiect the compressed air passing through the pipes Q or Q, Q in a downward direction, that is, in line with the len th of the pi es G or G. The pipes Q an Q are furtier novided with branch i es Q and Q having valves Q and Q", ot which the pipe Q opens into an annular chamber I of the pressure chamber 1, and the pipe Q opens into an offset J formed on the upper end of the pipe fixture J. Thus when a valve Q or Q is open at the time the corresponding valve F or F is 0 en then the compresse air passing througi such pipe acts on the material passing through the pipe fixture G or G to assist in causin the material to (low down the pi es G, a into the pipe fixture H in whici the material receives a main, forward impelling im ulse by the compressed air passing throng i the 'et pipe N. The material is thus forced down through the nozzle, and a further impulse is given to the material b the ressure from the ressure chamber supplied with pressure t rough the pipe Q, so that the material is forced downward into the pipe fixture J and the hose K, and another impulse is given to the material or mass by the compressed air passing by way of the pipe Q and the offset J into the ipe fixture J in the direction of the outlet t iereot. Thus from the foregoing it will be seen that a number of impulses are given to the material or mass to force the same from the chamber A or A to the nozzle L, which may be a desired distance from the point at which the machine is located. The upper end of the chambers A and A are connected by ipes R R with the pipe N, and the Salt? pi es R, R are provided with relief valves t, R ada ted to open on excess of pressure in the ciambers A, A to allow such surplus pressure to pass into the pipe N and to the 'et pipe N.

The valves and F are self-closing, and each is adapted to be held in open position during the time that the corresponding chamber A or A is employed for supplying plastic material to the nozzle L. For the purpose mentioned the valves F and F are in the form of turnable conical plugs, as plainly shown in Fig. 1, and on the stems F, F of the said valves are secured arms F, F connected with springs F, F for movim the valves F and F into closed position. l Vhen the valve F or F is in closed position the arms F or F stand in a horizontal position, and when it is desired to open the valve F or F the operator takes hold of the arm F or F and swings the same downward into vertical position to open the valve, as shown relative to the valve F in Fig. 1. The arm F or F when in verticaldposition is adapted to be engaged by one en of a lever S or S to hold the valve in open position against the tension of the spring F or F, and the levers S, S

are fulcrumed on brackets S, S n-o'ectin a l l a from the casings of the valves F, F. The levers S and S are pivotally connected with stems resting on the outer faces of the diaphragms U, U held in casings U, U connected by pipes U, U with a vacuum chamber V surrounding the jet pi )e N and attached to the upper end of the cross shaped pipe fixture H. It is understood that the pipes U, U extend from the inner sides of the casings U U so that when back pressure is produced in the vacuum chamber V the diaphra ms U and U are caused to move outwar d away from each other to move the stems T, T in a like direction whereby the corresponding lever S or S is given a swin ing motion to disenage St\i( lever from tie corresponding arm or F to allow the valve F or F to close by the action of its spring F or F. The vacuum chamber V has a contracted end V at the discharge end of the jet pipe N so that when the machine is in use and compressed air asses through the jet pipe N to force the p aster through the nozzle L, as previously mentioned, then a suction is produced in the suction chamber V and consequently the diaphragms U and U are held in innermost position and the lever S or S can hold the arm F or F locked in vertical position with the valve F or F in open position.

The vacuum chamber V is provided with a whistle or other alarm V adapted to be sounded by back pressure within the chamber V, as hereinafter more fully explained.

An emergency pressure valve W is connectedwith the pipe N andwith a. source of compressed air, and normally this valve W is in a closed position but is adapted to-be opened by back pressure within the vacuum chamber V through the medium of a diaphragm ressure device X provided with a housing containing a diaphragm X and connected at its under side by a pi e X with the vacuum chamber V. On tie upper side of the diaphragm X is held a stem X mounted to slide in the housing X, and the said stem en ages one end of a lever X in contact with the valve stem W of the emergency pressure valve \V so as to open the valve .\V whenever back pressure in the vacuum chamber V causes the diaphragm X to move upward and with it the stem X. It is understood that when this takes place a swingim motion is given to the lever X to press the valve stem V downward and thus open the emergency pressure valve \V. The lever X is pivoted on a bracket W held on the casing of the valve \V.

The operation is as follows: When both chambers A and A are filled with plaster in plastic condition then the operator in charge of the machine opens the valve F and locks the same in open position by engagement of the lever S with the arm F, as shown to the left in Fig. 1. The valves X 1, Q, Q and Q are then opened so that compressed air can pass through the {ct pi e N to produce a vacuum in the chain- )Cl' and a jet action in the fixture H to draw the plaster down throu h the open valve F and the pipe G into t 1e fixture H, the How of the plaster bein aided by the pressure in the top of the cliamber A supplied by way of the pipe I, and the flow icing aided in the )i )e G by the pressure entering under the deflector point G by way of the )ipe Q. The plaster by the action above tGSCl'llNXl is forced from the pi )e fixture ll into the nozzle I and through t- 1e latter into the fixture J and into the hose K and applying nozzle L to be supplied to the surface to be plastered, it being understood that the tlow of the plaster is aided by )ressure from the pressure chamber I and the compressed air entering the fixture J by way of the pipe Q. The operator in charge of the nozzle L can automatically shut oil the supply of plaster by bending the hose K adjacent the nozzle L so that a back pressure is produced in the vacuum chamber V and consequently the valve F is automatically released and moves into closed position thus shutting off the supply of laster from the chamber A. If it is desired to again proceed with the plastering operation it is necessary for the operator in char e of the machine to reopen the valve F anil to lock the same in open position by the lever S, as a vacuum is again produced in the chamber V owing to the outflow of the material to the nozzle L. In case the chamber A is emptied of its contents then the operator in charge of the nozzle L makes a kink in the hose K so that the valve F is automatically closed as above described by the back pressure in the vacuum chamber V, and the alarm V is also sounded so that the operator in charge of the machine now opens the valve F and locks the same in open position by engagim the lever S with the arm S", and the valves 1 and Q are 0 )cned to suppl pressure to the upper end of the cham an A and to the fixture G, the valves Q" and Q," remaining open while the valves Q, l" are preferably closed. The above-described operation is now repeated, that is, the contents of the chamber A are delivered to the nozzle L for plastering the desired surface. During the time the chamber A is in use the other chamber A can be refilled by opening the cover C, as previously explained. In case the hose K becomes clogged up by the material then the back pressure produced in the vacuum chan'iber V actuates the diaphragm X whereby the emergency pressure valve \V is opened to allow a heavy air pressure to pass into the jet pipe N to force out any obstruction that may be in the hose K.

Although the pi 105 Q" and Q have been described as supplying compressed air to the fixtiircs G, G and as aiding the (low of material through the pipes G G the said pipes are, however, mainly used for supplyin pressure when it is desired to clean out t to pipes G", G of any material that may be in the said pipes.

.n practice, the frame 0 is preferably mounted on a truck to )ermit. of conveniently wheeling the machine about.

Having thus described my invcnlion, I claim as new and desire to secure by Letters Patent:

1. A. pneumatic plastering umchiuc, comprising a chamber adapted to contain a plastic mass and provided with an outlet, a tubular connection loading from the. said outlet. to an applying nozzle for dischargingthe drastic mass onto a surface to be plastered, a source of pressure supply, a series of jet pressure devices connected with the said source of pressure supply and connecting with the said tubular connection to impart propelling impulses successively to the mass to force the latter in a continuous :-;ll'c:llll through the said tubular connection and to and through an applying nozzle. a self-clos ing device for the said outlet, and a pneumatic releasing dcvice holding the said .selfclosing device normally in an open position, the said releasing device being connected with one of the said jet pressure devices t actuate the releasing device on closing the said tubular connection to relieve the said self-closing device and to thus allow the latter to close the outlet.

2. A pneumatic plastering machine, comprising a chamber adapted to contain a plastic mass and provided with an outlet, a tubular connection leadin from the said outlet to an applying nozziia for discharging the plastic mass onto a surface-to be plastered, a source of pressure supply 'a series of et pressure devices connected with the said source of pressure supply and connecting with the said tubular connection to impart pro elling im ulses successively to the mass to orce the utter in a continuous stream through the said tubular connection and to and t pressed va ve in the said outlet, and a pneurou h (in applying nozzle, a springmatic releasing device normally holdin the said valve in open position, the said re easing device being provided with a diaphragm, and a vacuum 0 amber connected with one of the said jet pressure devices to actuate the releasing device on closing the tubular connection to release the valve and to thus allow the latter to close.

3. A pneumatic plastering machine, comprising a chamber adapted to contain a plastic mass and provided with an outlet, 0. tubu lar connection leadin from the said outlet to an applying nozz e for discharging the plastic mass onto a surface to be a source of pressure suppl a series of jet pressure devices connecte with the said source of pressure supply and connecting with the said tubular connection to impart pro elling impulses successively to the mass to orce the latter in a continuous stream throu h the said tubular connection and to and through an applying nozzle, a pressure device connected wit 4 t e said chamber to force the mass therein into the outlet, and a relief valve connected with the said chamher and connected withthe source of pres sure supply.

4. A pneumatic plastering machine, com- ,prising a chamber adapted to contain a plastic mass and provided with an outlet, a tubular connection leadin from the said' outlet to an applying nozz e for dischar ing the plastic mass onto a surface to be p astered,

a source of pressure suppl a series of jet pressure devices connecte .with the said plastered,

source of pressure supply and with the said tubular connection to impart propelling imulses successively to the mass to force the Patter in a continuous-stream throu h the said'tubular connection and to and t rough an applying nozzle, an emergency pressure valve-connected with a source of pressure connected with the sai supply and with one of the said jet pressure devices, and a pneumatic actuatin device for the said emergency pressure vs ve having a diaphragm and a vacuum chamber connected with the respective jet pressure device.

5. A pneumatic plastering machine, comprising a chamber adapted to contain a plastic mass and provided wit-h an outlet having a self-closing valve, a. tubular connection leading from the said outlet, amain pressure jet opening into the said tubular connection and connected with a source of pressure su ply, a vacuum chamber surrounding the sai jet and opening into the said tubular connection, a diaphragm connected at one facewith the said vacuum chamber, and a locking and releasing device for the said outlet valve connected with the other face of the said diaphragm to release the valve on back pressure.

6. A pneumatic plastering machine, comprising a chamber adapted to contain a plastic mass and provided with an outlet having a self-closing valve, a tubular connection leading from the said outlet, a main pressure jet opening into the said tubular connection and connected with a source of pressure su ply, a vacuum chamber surrounding the said jet and openin into the said tubular connection, a diap ragm connected at one face with the said vacuum chamber, a locking and releasing device for the said outlet valve connected with the other face of the said diaphragm to-release the valve on back pressure, and an alarm connected with the said vacuum chamber.

7. A pneumatic plastering machine, comprising-a. chamber adapted to contain a plastic mass and provided with an outlet having a self-closing valve, a tubular connection leading from the said outlet, a main pressure jet opening'into the said tubular connection and connected with a source of pressure su ply, a vacuumlchamber surrounding the said jet and openin into thesaid tubular connection, a dia hragm connected at one face with the said vacuum chamber, a locking and releasing device for the said outlet valve connected with the other face of the said diaphra to release the valve on back pressure, an an emergency pressure valve main jet.

In testimony whereof I have signed my name to this specification in the two subscribing witnesses. Y

erms C N Witnesses:

-JOHN R. Jomcs, j Gnosos C. Orro, 

